It’s not correct to say that our DOT standards are out of date. In fact there is some debate about the Snell standard vs the DOT standard. The area is around

It’s not correct to say that our DOT standards are out of date. In fact there is some debate about the Snell standard vs the DOT standard. The area is around the helmet impact rating. A higher rated impact helmet is generally more rigid and will potentially cause brain injury at lower speeds. Essentially for helmets you trade-off high speed impact survivability vs low speed injury protection. The claim of many riders, myself included is that crashes happen at lower speeds and thus a less rigid helmet is likely more optimal. Having said that there have been significant advances in helmet design in last few years that address low speed impact as well as meet the Snell standard. They do this by reducing the transfer of rotational energy on the user. See for example (6D helmet manufacturer): https://youtu.be/B6jI0w5UFLs https://youtu.be/B6jI0w5UFLs Having said all that a helmet without a chinstrap, such as this one, is basically like not wearing a helmet at all. In a crash, the helmet isn’t going to stay on. If the helmet doesn’t stay on, it’s not going to do anything.